快捷键

ng-http-interceptor

请求拦截

interceptors/param.interceptor.ts

import { Injectable } from '@angular/core';
import {
    HttpEvent, HttpInterceptor, HttpHandler, HttpRequest
} from '@angular/common/http';
import { environment } from 'src/environments/environment';

@Injectable({
    providedIn: 'root'
})
export class ParamInterceptor implements HttpInterceptor {
    intercept(req: HttpRequest<any>, next: HttpHandler) {
        const modifiedReq = req.clone({
            setParams: { icode: environment.icode }
        })
        return next.handle(modifiedReq);
    }
}

在模块中提供

import { HttpClientModule, HTTP_INTERCEPTORS } from '@angular/common/http'
import { ParamInterceptor } from './interceptors/param.interceptor';
@NgModule({
  ...
  providers: [
    ...
    {
      provide: HTTP_INTERCEPTORS,
      useValue: ParamInterceptor,
      multi: true,
    }
  ]
})

响应拦截

interceptors/notification.interceptor.ts

import { Injectable } from '@angular/core';
import {
    HttpEvent, HttpInterceptor, HttpHandler, HttpRequest, HttpClient, HttpResponse
} from '@angular/common/http';
import { tap } from 'rxjs/operators';

@Injectable({
    providedIn: 'root'
})
export class NotificationInterceptor implements HttpInterceptor {
    intercept(req: HttpRequest<any>, next: HttpHandler) {
        return next.handle(req).pipe(
            tap((event: HttpEvent<any>) => {
                if(event instanceof HttpResponse 
                  && event.status >= 200
                  && event.status < 300
                ) {
                    console.log('截取成功')
                }
            })
        )
    }
}